with initial time, temperature and viscous pressure at \(\tau _i=0.4\)  fm, \(T_i=0.5\)  GeV and \(\pi _i=0\) . Fig.(REF ) (right panel) shows the proper time \((\tau )\)  evolution of pressure anisotropy
\(P_L/P_T=(P-\pi )/(P+\pi /2)\)  for the three values of \(n\)  and four sets of \(\eta /s\)  ratio. The \(n=0\)  case as shown in [1]} under predicts the BAMPS data [2]} which becomes prominent
for large values of viscosity. \(n=1\)  case clearly over predicts the data a good deal showing even larger deviation from BAMPS for high \(\eta /s\) . However, the \(n=1/2\)  situation
remarkably agrees with BAMPS results even with large viscosity like \(\eta /s=3.0\)  throughout the evolution range. In [3]} the \(n=1/2\)  momentum dependence has been related to the dynamics of a
two-flavoured quark-gluon gas where the BAMPS data has been extracted for the same by a parton cascade model [4]}. This reasonable agreement of numerical data with fractional power of momentum dependence
is very illuminating in the context of Ref [3]} which argued that most of the interaction theories relevant for QGP lie between the two extreme limits of linear (\(n=0\) ) and quadratic (\(n=1\) ) ansatz.
